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Solar ultraviolet bursts in a coordinated observation of IRIS, Hinode and SDO

Tian, Hui; Samanta, Tanmoy; He, JianSen +3 more

Solar ultraviolet (UV) bursts are small-scale compact brightenings in transition region images. The spectral profiles of transition region lines in these bursts are significantly enhanced and broadened, often with chromospheric absorption lines such as Ni~{\sc{ii}} 1335.203 and 1393.330 Å superimposed. We investigate the properties of several UV b…